Stage I Endometrial Cancer FIGO 2023

**Semantic type:** Neoplastic Process

**Definition:** FIGO stage I includes: 1A1: non-aggressive histological type of endometrial carcinoma limited to a polyp or confined to the endometrium; 1A2: non-aggressive histological type of endometrial carcinoma involving less than 50% of the myometrium with no or focal lymphovascular space invasion (LVSI) as defined by WHO criteria; 1A3: low-grade endometrioid carcinoma limited to the uterus with simultaneous low-grade endometrioid ovarian involvement; IB: non-aggressive histological type of endometrial carcinoma involving 50% or more of the myometrium with no LVSI or focal LVSI; and IC: aggressive histological type of endometrial carcinoma, i.e. serous, high-grade endometrioid, clear cell, carcinosarcoma, undifferentiated, mixed, and other unusual types without any myometrial invasion. (FIGO 2023)

**Synonyms:** - Stage I Endometrial Carcinoma FIGO 2023